Purchased the “Signature” line of bakeware. Upon first use of 12 x 17 baking sheet, the sheet warped so badly that all of my food slid together. You would think that they would treat their products before selling them. I went back to their site, to amazon, and anywhere else i looked i saw that this was not a unique experience and it was the same store across all of their bakeware lines. This is also not something new to them. I feel that the integrity of this company is questionable. Calphalon used to mean something.I’m sure it still does to anyone who hasn’t tried their bakeware.